Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d328a5aa3686d0a…

MALICIOUS

PDF

74.7 KB Created: 2021-04-16 06:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a8b209f8112bb1d37ec178334f8396e0 SHA-1: 10439bfc342dea94f08b065b8e4beb05b965df7f SHA-256: 8d328a5aa3686d0a21478a9803b280de7d4174b8594b6a26eb5a0649c9a0e176
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/strik?utm_term=how+much+does+it+cost+to+get+an+outboard+motor+service PDF link annotation
    • http://sixesijilolun.mywebcommunity.org/char_broil_oil_less_fryer_owners_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_605a0fae4b4f4.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/tiwobuguju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_5fd333197e3ab.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/uppababy_mesa_car_seat_strap_covers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456699/normal_5fd3797bdba47.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/EKjghir/hot_rod_cars_for_sale_uk.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/fried_green_tomatoes_book_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/lakabarobuk/1Uxgf8f/zikumugowufekapik.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/rujagud.pdfIn PDF document text
    • http://bizowokare.getenjoyment.net/zovikomoremase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484380/normal_6007d6f90fd98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502698/normal_604a59b518e7e.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/nekola.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/jjidkWB/ragdoll_fists.pdfIn PDF document text
    • https://cdn.sqhk.co/gepumenujeme/er12508/tiwubaweromebasi.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/hfPX5jh/10764816359.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupuzawov.onlinewebshop.net/carol_of_the_bells_piano_sheet_music.pdfIn PDF document text
    • http://bugazepoja.onlinewebshop.net/29216739089.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/turovozasagago.pdfIn PDF document text
    • http://dagapevas.rf.gd/contrato_de_arrendamiento_de_vivienda_colombia_2020.pdfIn PDF document text
    • http://nisanexurosil.rf.gd/xazidunanozosajesenegim.pdfIn PDF document text
    • http://jaberorer.epizy.com/21703209671.pdfIn PDF document text
    • http://wixesikive.epizy.com/wojujezikoxezofakepevow.pdfIn PDF document text
    • http://dogirajuwuxo.epizy.com/shein_dresses_formal.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 5572 bytes
SHA-256: 06330a9eebca5067ba807f5661747745a2890fc4d268ea877dae16667dcc6e25
font_01_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 10160 bytes
SHA-256: 415c06750ebcef169fab3fce72325566fbb74a9593cdd33f8cdd6fdbe72f4d28